Impulse correcting repeater



March 14, 1950 R. w. JONES IMPULSE CORRECTING REPEATER 2 Sheets-Sheet 1' Filed Aug. 50, 1946 2 W. mum

FIG.|

INVENTOR. W. JONES ROY ATII'ORNEY March 14, 1950 R. w. JONES IMPULSE CORRECTING REPEATER Filed Aug. 30, 1946 ZSheets-Sheet 2 I I 08 'l LIOB' FIG.2

INVENTOR.

ROY W. JONES ATTO RNEY Patented Mar. 14, 1950 UNITED STATEfi PATENT OFFICE IMPULSE CORRECTING REPEATER Application August 30, 1946, Serial No. 694,045

5. Claims.

nated. The open interval of the corrected impulses being independent of the duration of the incoming impulses. The present invention is in the nature of an improvement on the impulse correcting repeater circuits disclosed in the Lomax-Jones application, Serial Number 666,283, filed May 1, 1946, now Patent Number 2,487,252 granted November 8, 1949,. and in the Kessler application, Serial Number 694,043, filed August A feature of this invention is the manner in which a relay in. the repeater is arranged to opcrate on the first break of the incoming impulses and on eachvsubsequent break,, the same relay effective with a second relay to determine the duration of the break period of a corresponding impulse to be transmitted over the outgoing connections of the repeater on cessation of the incoming impulse.

Another feature is the manner in which the repeater line relay is arranged with its back contacts connected in the operating circuits of the two relays whose operating times are effective to determine the lengt of the break period of, the outgoing impulses.

Still another feature is the manner in which a holding relay is connected in the circuit to provide means for holding a control relay which is normally energized during the break period of the incoming impulses until such time as a second relay initiates a corresponding outgoing pulse independent of the direction of the incoming impulse, break period and whereby the same holding relay provides a. circuit for holding the, second relay which is energized during each make period of the incoming impulses for a definite period of. time and independent or the duration, of the incoming impulse make period.

A.- further feature of this invention is the provision of a pair of incoming levels for seizing the repeater from one direction and a. single incomlug level for seizing the repeater from the other direction, the repeater being arranged to automatically transmit an impulse over said single level end of the repeater to perform a trunking operation when seized over one of said pair of levels. to provide reverse battery supervision if seized over the other of said pair of levels, and on receipt of impulses over either of said levels to transmit a corrected impulse over said single level end of the repeater only on termination of each corresponding incoming impulse. The advantage of the im ulse transmitted automatically is evident where the circuit is to be used in an automatic sub-oflice where. it is necessary to reach the toll operator over trunks to a tandem automatic ofiice by dialing a single digit. The stop dialing feature makes this repeater most desirable for use in an inter-toll dialing network.

A further feature of this invention is the provision of stop dialing supervision in this type repeater to allow associated automatic switching sufiicient operating time when the repeater is seized over a certain level.

The invention both as to its organization and method of operation, together with further objects and advantages thereof, will best be understood by reference to the following specification and the accompanying drawings.

The accompanying drawings, Figures 1 and 2, when properly arranged in a side by side manner illustrate a two-way repeater circuit having the invention embodied therein. The repeater includes the master office level having conductors Zn, 258, M9 and the free service level having conductors, 2| l, 212, M3 all accessible to a local subscriber placing a call to a distant exchange. A relay set in the repeater is actuated when a call is received over the master cffice level, to send an impulse ahead over conductors 2M and H5 for the purpose of automatically connecting the subscriber to a toll trunk in the ofiice connected to the outgoing side of the repeater. A relay set in. the repeater is operated at times to notify the operator that the call is of a toll nature. The repeater is arranged to repeat impulses in both directions, and to correct impulses repeated in one direction. A talking circuit is completed through the repeater in either, direction on cessation of the incoming impulses by an opera..- tion of the called party. In the event. that a call is received. from a distant exchange over conductors 2M and M5 the repeater is arranged to send a stop dial signal back over the lines connected thereto until such time as the repeater causes an associated line circuit. to. have a finder complete the connection. Reverse battery supervision, is

provided on calls incoming over the free service level.

Although numerous repeater circuit arrangements are possible, for purposes of explanation it will be assumed that a local subscriber has access to the master office and free service level over a finder and a connector connected therebetween and that the single level side of the repeater is connected to a repeater of similar nature located at a distant exchange. Calls received over the single level side of the repeater from the distant repeater are extended over conductors 226, 22'! and 228 to a line circuit and a finder connected thereto. The line circuit is of the well known type which extends ground over the test lead to the repeater when the finder locates the trunk.

In view of the above brief description of the invention and certain of its more permanent features, the ope-rations involved in setting up connections in a system embodying the same will now be described in detail. A connection to the repeater over the free service level will be considered first. As an incoming call reaches the repeater over conductors 2I I, 2I2, 2I3 a loop circuit is completed from the seizing switch over conductors 2H and 2I2, contacts I t and i5, conductors 220 and 22I, repeater coil windings 224 and 225, contacts 93 and 95 to relay 00. Relay 80 operates and at its contacts 8i controls a point in a self pre-energizing circuit, at its contacts 82 completes a circuit to relay H0, and at its contacts 83 opens a point in the circuit for relays I50 and I0. Relay IIO operates and at its contacts lII closes a point in the outgoin loop pulsing circuit, at its contacts H2 completes a circuit to the polarizing Winding of electro-polarized shunt field relay I20, at its contacts H3 removes ground from the all trunk busy registering conductor 2E0, at its contacts 110 completes a circuit to relay I00, and at its contacts I I5 further prepares the circuit to relays l and i511.

Relay I00 operates and at its contacts IOI closes a point in the pro-energizing circuit for relay 80, at its contacts I03, I00, I completes an outgoing loop circuit over conductors 2M. and 215, the circuit in the repeater to the conductors now extending from conductor 2 I4 over contacts I9I, I03, IGI, I iI, III, repeater coil winding 222, contacts I04, the operating winding of polarized relay I20, contact I05, repeater coil winding 223, and contacts I00 to conductor 2I5. The windings of relay I20 are difierentially energized and this relay is indifierent to operate. Relay I00 at its contacts I06 prepares a circuit for reverse battery relay I0, at its contacts I06 opens a point in the circuit to relay I90, at its contacts I07 connects ground to conductor 2I3 over contacts I6, l0? and 98 to busy the repeater to the connectors, at its contacts I08 completes a circuit to relay 00 over contacts I8, and at its contacts I08 opens the normally energized relay I30. Relay l0 operates and at its contacts lI opens a point in one of the operating circuits to relay 50. Relay I30 releases and at its contacts effects connections having no function at this time.

Assuming now receipt of a series of impulses over conductors 2H and 2 l2. For the first break of the impulses received, relay 80 releases and at its contacts BI inserts resistance 226 in series with relay 80 for pre-energizing purposes, at its contacts 82 opens the circuit to relay III], which is slow to release and will hold for the series of impulses, and at its contacts 83 completes a circuit to relay I0 over contacts 56 and IE5 and a circuit to relay l50 over contacts 56, I I5, I15 and I63. Relay I0 operates and at its contacts II removes one Winding 223 of the repeater coil from the loop circuit and at its contacts I2 inserts the non-inductive resistance 22? in the pulsing circuit in shunt of relay I20. Relay I50 operates and at its contacts I51 completes a self-holding circuit over contacts H4, I5I, I15 and I03, at its contacts I52 prepares a circuit to relay I60.

On the first make after the first break relay is energized, and at its contacts BI disconnects the resistance 220 formerly in series with relay 80 so that the relay will release more quickly, at its contacts 82 completes a circuit to relays I00 and l I0, and at its contacts 83 opens the operating circuits to relays I0 and E50. Relay "50 operates and at its contacts IBI opens the outgoing repeater circuit thereby effecting the break period of the first repeated impulse over conductors 2M and 2I5, and at its contacts I 62 completes a self-holding circuit over contacts IM, I52, and E52, and at its contacts I03 opens the holding circuit to relay I50. Relay 70 being slow to release, holds for the series of impulses. Relay I50 now releases and at its contacts I5l opens a further point in its self-holding circuit, and at its contacts I52 opens the holding and operating circuits to relay I00. Relay I60 releases and at its contacts I6I closes the loop impulse repeating circuit, and at its contacts I62 opens a further point in the self-holding circuit, and at its contacts 63 prepares an operating circuit for relay I50. Thus it will be noted, that the length of the repeated pulse over outgoing conductors 2M and 2I5 is determined by the release times of relays I50 and I50. The outgoing impulses are of a definite length independent of the duration of the incoming impulses. The first outgoing break period is effected during the make period following the break period of the first incoming pulse. The repeater circuit repeats each incoming impulse as outlined above. After the cessation of incoming impulses, relays 40, 80, I00 and H0 remain energized. When the called party answers, reverse battery is applied over incoming conductors 2M and 2I5 from the subsequent repeater and relay I20 is now operated as both windings are energized in the same direction, Relay I20 at its contacts I2I completes a circuit to relay I0 over contacts I06 and I2I. Relay I0 operates and at its contacts II bridges relay 20 across conductors 2H and 2I2, at its contacts I2, I3, I 3 and I5 reverses battery over the conductors 2H and 2I2, at its contacts I6 removes the ground short circuit for relay 20, at its contacts I? prepares an operating circuit to relay 50 over contacts I08 and at its contacts I8 opens the operating circuit to relay 40. Relay 20 does not perform a function at this time. Relay 00 after a brief interval releases, and at its contacts lI closes the operating circuit to relay 50. Relay 50 operates and at its contacts 5! and 52 opens the circuit which bridges relay 20 across conductors 220 and 22!, at its contacts 53 completes a second holding circuit to relay I00, at its contacts 54 short circuits relay 20 to ground, and at its contacts 55 prepares an operating circuit for relay 60. A talking circuit is now extended through the repeater.

If the called party releases first, the operating winding of relay I20 deenergizes. Relay I20 releases and at its contacts i2I opens the operating circuit to relay I0. Relay l0 deenergizes and at its contacts I2, I3, I4, and I5 restores a normal battery connection over conductors 2lI and 2I2,

at its contacts I6 applies a second short circuit to relay 20, at its contacts I! opens the operating circuit to relay 50, and. at its contacts I8 completes an operating circuit to relay 40. Relay 50 releases and at its contacts 5| and 52 bridges relay 20 across conductor 220 and 22!, at its contacts 53 opens the secondary holding circuit to relay I00, at its contacts 5i removes secondary ground to the lower winding of relay 20, at its contacts 55 opens a further point in the operating circuit for relay 60, and at its contacts 56 closes a point in the operating circuits for relays I and I50. When the calling party hangs up, relay 80 will release and at its contacts 82 open the operating circuit to relay I I t, and at its contacts 83 close a circuit to relays l0 and I50. Relays I0 and I50 energize but perform no function. Relay III! after an interval releases and at its contacts opens the operating circuits to relays I0, I00 and I50. Relay I00 releases and at its contacts I00 closes the operating circuit to relay I30. Relay I30 operates, and removes ground from conductor 2 I0. The set is now in its normal released condition.

If the calling party hangs up first, relay 80 releases and at its contacts 02 opens the operating circuit to relay H0, and at its contacts 83 completes a circuit for relay 00 over contacts 83, 55, I, repeating coil winding 223, contacts I94 and conductor 2I5. Battery is reversed on conductors 2M and 2I5 at this time. Relay Bil operates and at its contacts GI completes a holding circuit for relay 50. After an interval, relay H0 releases, and at its contacts IIZ opens the polarizing winding of relay I20 and at its contacts II4 opens the operating circuit to relay I00. Relay I00 holds over contacts 53. Relay I20 releases and at its contacts I2! opens the circuit to relay I0. Relay I0 releases and at its contacts I'I opens the circuit to relay 50 and at its contacts I8 closes a circuit to relay 40. Relay 40 energizes and at its contacts 4I opens a further point in the circuit to relay 50. Relay 50 hold over contacts S l. When the called party now hangs up, battery is restored to normal over conductors 2M and H5. Relay 6t thereupon releases and at its contacts 6i opens the circuit to relay 50. Relay 50 releases and at its contacts 53 opens the holding circuit to relay I00. Relay I00 releases and at its contacts I08 opens the operating circuit to relay 40 and at its contacts I08 completes a circuit to relay I30. After an interval'relay 40 releases. Relay I30 energizes and the repeater is now restored to its normal position.

Now, assume a call is extended to the repeater over the master ofiice level which comprises conductors 2|! and 2I8. A loop is completed through relay 30 in series with relay 8.0 over contacts 93, coil 224, conductor 220, relay 30, conductor 2I'I, the line circuit connected thereto, conductors 2I8 and 22I, coil 2225, contact 95 and the lower winding of relay 30. Relay 80 operates and at its contact 8i opens a point in its preenergizing circuit, at contacts 82 completes a circuit to relay I I0. Relay 30 operates at the same time and at its contacts 3I completes a circuit to relay I40 over contacts I33. Relay I40 operates and at its contacts I4'I opens a point in the outgoing loop circuit. Relay IIil operates and at its contacts III closes another point in the outgoing loop circuit, and at its contacts II I. completes a circuit to relay I 00. Relay I00 open I ates and closes the loop circuit described here tofore at its contacts I03, H34, and 105, and at and relay IE0 at its contacts I33 opens the op-- Relay I I-0 releasescrating circuit to relay I 30. after an interval and recloses the loop circuit at its contacts It. It will be noted, therefore, that the repeater, when seized over the master office level, automatically sends an impulse ahead, the break interval of the impulse being determined by the release time of relay M0. By connecting the first level of the seized incoming selector at a distant exchange to the toll operator position, the repeater is effective to conmeet a subscriber to the operator by merely seizing the repeater set.

In the event that the call reaching the repeater over the master oiiice level is from a paystation, the paystation tone will reach the repeater over conductor are and travel over contacts 98, I31, and It to ground. When the operator answers, relay I20 energizes and at its con-- tacts I25 completes a circuit to relay I0 over contacts I08. Relay It operates to complete the talking connection at its contacts I2, I3, I4 and I5 as previously described, at its contacts II bridges relay 2c across conductors 220 and 22L at its contacts it removes ground from conductor H9, at its contacts I? prepares an operating circuit for relay 50, and at its contacts I0 opens the operating circuit to relay 40. The paystation tone now flows through the lower winding of relay 20 and induces a tone in the upper winding of same. This induced tone is placed across conductors 220 and 22! and transmitted through the repeater to the operators. Relay 40 releases and completes the operating circuit to relay 50. Relay 50 operates and at its contacts 54 regrounds conductor 2% and short circuits the lower winding of relay 2c thereby terminating transmission of the paystation signal to the operator, and at its contacts 5i and 52 removes the relay bridge from the line.

Now assuming an incoming call reaches the repeater over connections 2I i and 2I5, a circuit is completed through the upper winding of relay I80, contacts I00, coil 222, contacts I02, IE I, conductor 2M, the circuit connected between same and conductor 2I5, contacts I94, coil 223, contacts I05 and the lower winding of relay I80. Relay I80 operates and at its contacts ISI closes a point to prepare a loop pulsing circuit over conductors 22! and 220, at its contacts I82 completes a circuit to relay I'III, at its contacts I83 performs no function at this time. Relay I10 operates and at its contacts III prepares a circuit to relay I40 over conductor 226, at its contacts I02 removes ground from the all trunks busy connection, at its contacts Iiti completes a circuit to the first winding of polarized relay I20, at its contacts II I prepares a circuit for relay III, at its contacts I15 opens a point in the circuit to relay I50, and at its contacts I16 completes a circuit to relay 90. Relay 30 energizes and at its contacts 9| and are further prepares the outgoing loop pulsing circuit which passes over conductor 22? and 228, at its contacts I53 and removes relay 80 from the pulsing circuit, at its contacts at 0S completes the pulsing circuit and inserts the operating winding of relay I20 in series with the pulsing circuit, at its contacts cor circuit to relay 96 over contacts iii-ii, contacts iii) connects ground to conduc". busy the repeater to local connectors. operates and at its contacts iQl, iil i reverses battery over conductors if i thereby sending a stop dial signal bac originator of the call. The outgoing p completed by the line circuit connected to c ductors '22? and 223 extends over contacts 82, conductors coil a nately open and close said operating circuit, and thereby operate said control relay, a second relay having an operating circuit controlled by operation of said means to cause said second relay to transmit a corrected impulse only on termination of the corresponding incoming ime, a hold'ng relay operated responsive to the operation of said means to maintain said control r ay energised ai'ter said means has is opened sa control relay operating circuit until said second relay has initiated the break period of a corrected impulse, said holding rela operated to main ain said second relay energized for definite period 01 time independent of the n of said means, the duration of the brea period of said co rested impulses being ded by the operating times of said control i second relay independent of the make to treat: ratios oi said incoming impulses.

ii two-Way repeater arranged to receive imover a single level from one direction and of levels om the other direction, means said repeater over any one of said levels, means in said repeater operated on ret an impulse over either one of said pair evels to transmit a corrected impulse over 516 level si-d oi said repeater only upon cessation or are corresponding incoming impulse, ensued when said repeater is seized over aid pair or levels to automatically transuise over said single level side of said trunking purposes, means for prorse batery supervision Whenever said seized over the other of said pair of ne operated to transmit a stop dial r said single level Whenever said repeater seized over said single level, and means I r sponsive to receipt of a supervisory complete a talking circuit through said i: s, contacts operating winding of relay S26, contacts ing 225, contacts 9i and conductor the finder to hunt for the trunk v i nected to repeater conductors and the trunk is found, ground is connect finder through the line circuit to co which completes a circuit to relay tacts l'ii. Relay t ill operates and at i' it? opens the operating circuit to Relay its releases and at its con i93, i9 2 restores normal battery co conductors 25 i and 2155 thereby stop-dial signal over same. In pul over the conductors 2M and 3.55 e z of relay iiiil over contacts ifii, receipt of the first break period reia and at its contacts idi opens the 01 thereby transmitting a correspo period over conductors 2 'i and tacts 532 opens the operating circaand at its contacts 33 completes a contacts fi l to relay le. Relay release'and holds up for the i pulses. Relay it operates and at its co removes Winding from the pulsi and at its contacts 52 performs a runes: is not effective at this time.

The impulses are repeated as describ cessation of the incoming impulses lid, 93, M0 and it remain in the e dition. After a brief interval reia When the called party answers, the winding of relay iii? is energized, there ing the polarized relay l 'd to energi e 12s at its contacts 521. completes IE6 to relay Hill. Relay lilo energir its contacts iiil, i552, I83 and i9 tery to establish a talking circuit repeater. Release of the repeater restoration of the receiver of either If the calling party restores the relays m and its release and at t effect the release of relays l'li, c If the caled party hangs up first, rel-a; leases and at its contacts iii opens to relay iilil. Relay {Bil releases and r mal battery to the line. Relays one, a normally energized relay, 2. line third relay connected in series with said lire relay, means for seizing said repeater over i coming connections, means operated reto seizure of said repeater to operate ed relay to automatically it an impulse said outgoing connecd a second means operated responsive to ation of said series relay to determine the of said impulse.

up and efiect release of relay The is L.. 639173365 ll to T891989 e outgoing circuit l thereby terminate the open period of the in its normal released condition.

While particular embodiments of the nv n i have been illustrated, it is to r lse correcting repeater arranged es s incoming impulses, each of said imes a make and a break period, the -o of said periods being diferent at different ment may be resorted to rbout the true spirit and scope of the fined in t appended 1 times, a line relay energized during each make t is claimed period and deenergiz-ed during each break period 1. In an impulse correcting repeaterarranged 70 Of incoming impulses, El 001113101 y. to receive impulses, each of impul e: hayl n relay, n op r i irc including ck a k d a break period th contacts on said line relay completed for operperiods b i different t different times, a ating said control relay each time said line relay trol relay having an operating circuit, means lg during a break pe d, a loc responsive to said incoming impulses to alter- 75 circuit for s d control relay n ludi nta ts on said control relay completed by the operation of said control relay, an energizing circuit for operating said pulsing relay, normally open control contacts on said control relay closed by the operation of said control relay to prepare said energizing circuit of said pulsing relay, make contacts on said line relay and said control contacts on said control relay completing said energizing circuit to energize said pulsing relay each time said line relay is energized during a make period following a break period, a locking circuit for said pulsin relay including contacts on said pulsing relay completed by the operation of said pulsing relay, normally closed contacts on said pulsing relay included in both said operating and locking circuits of said control relay opened by the operation of said pulsing relay to deenergize said control relay, said normally open control contacts on said control relay also included in said locking circuit of said pulsing relay to 10 cause the deenergization of said pulsing relays in response to the deenergization of said control relay, and pulsing contacts on said pulsing relay operated by the energizations and deenergizations of said pulsing relay for transmitting corrected outgoing impulses having break periods determined onl by the operating time of both said control and pulsing relays.

ROY W. JONES.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATE$ PATENTS Number Name Date 1,747,405 Beckerath Feb. 18, 1930 1,831,730 Ahlberg Nov. 10, 1931 2,061,802 Kroll et a1 Nov. 24, 1936 

